From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1bon0144.outbound.protection.outlook.com [157.56.111.144]) by dpdk.org (Postfix) with ESMTP id 43EA6C346 for ; Sat, 9 May 2015 18:27:16 +0200 (CEST) Received: from CY1PR01MB1391.prod.exchangelabs.com (25.163.18.25) by CY1PR01MB1391.prod.exchangelabs.com (25.163.18.25) with Microsoft SMTP Server (TLS) id 15.1.154.19; Sat, 9 May 2015 16:27:13 +0000 Received: from CY1PR01MB1391.prod.exchangelabs.com ([25.163.18.25]) by CY1PR01MB1391.prod.exchangelabs.com ([25.163.18.25]) with mapi id 15.01.0154.018; Sat, 9 May 2015 16:27:13 +0000 From: "Clark, Gilbert" To: "dev@dpdk.org" Thread-Topic: Getting started - sanity check Thread-Index: AQHQinAxC3kaXoBYj06URka9hHWDrA== Date: Sat, 9 May 2015 16:27:12 +0000 Message-ID: <1431188832058.4524@ohio.edu> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dpdk.org; dkim=none (message not signed) header.d=none; x-originating-ip: [24.160.185.15] x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:CY1PR01MB1391; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0; PCL:0; RULEID:(5005006)(3002001); SRVR:CY1PR01MB1391; BCL:0; PCL:0; RULEID:; SRVR:CY1PR01MB1391; x-forefront-prvs: 05715BE7FD x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(6009001)(164054003)(110136002)(36756003)(102836002)(87936001)(75432002)(117636001)(107886002)(46102003)(5001960100002)(90282001)(92566002)(86362001)(106116001)(229853001)(89122001)(88552001)(2351001)(77156002)(62966003)(40100003)(15975445007)(2656002)(122556002)(66066001)(19580395003)(450100001)(189998001)(50986999)(15395725005)(2900100001)(2501003)(54356999); DIR:OUT; SFP:1102; SCL:1; SRVR:CY1PR01MB1391; H:CY1PR01MB1391.prod.exchangelabs.com; FPR:; SPF:None; MLV:sfv; LANG:en; Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: ohio.edu X-MS-Exchange-CrossTenant-originalarrivaltime: 09 May 2015 16:27:12.3513 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f3308007-477c-4a70-8889-34611817c55a X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR01MB1391 Subject: [dpdk-dev] Getting started - sanity check X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2015 16:27:16 -0000 Hi folks: I'm brand new to DPDK.=A0 Read about it off and on occasionally, but never = had the chance to sit down and play with things until now. =A0It's been fun= so far: just been working on a few toy applications to get myself started. I have run into a question, though: when calling rte_eth_tx_burst with a ri= ng-backed PMD I've set up, the mbufs I've sent never seem to be freed.=A0 T= his seems to make some degree of sense, but ... since I'm new, and because = the documentation says rte_eth_tx_burst should eventually free mbufs that a= re sent [1], I wanted to make sure I'm on track and not just misunderstandi= ng the way something works [2]. Thanks, Gilbert Clark [1] From http://dpdk.org/doc/api/rte__ethdev_8h.html=A0: It is the responsibility of the rte_eth_tx_burst() function to transparentl= y free the memory buffers of packets previously sent [2] From lib/librte_pmd_ring.c: static uint16_t eth_ring_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs) { void **ptrs =3D (void *)&bufs[0]; struct ring_queue *r =3D q; const uint16_t nb_tx =3D (uint16_t)rte_ring_enqueue_burst(r->rng, ptrs, nb_bufs); if (r->rng->flags & RING_F_SP_ENQ) { r->tx_pkts.cnt +=3D nb_tx; r->err_pkts.cnt +=3D nb_bufs - nb_tx; } else { rte_atomic64_add(&(r->tx_pkts), nb_tx); rte_atomic64_add(&(r->err_pkts), nb_bufs - nb_tx); } return nb_tx; } This doesn't ever appear to free a transmitted mbuf ... unless there's code= to do that somewhere else that I'm missing?